JPH05157631A - Bus temperature monitoring device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of electric shock accidents which occurs when a worker directly touches charged sections, namely, buses when he repairs or replaces the temperature sensor of a bus temperature monitoring device. CONSTITUTION:A temperature detecting member 20 and temperature sensor 22 are attached to a frame electrically insulated from buses 1 and the sensor 22 indirectly measures the temperatures of temperature measuring members 21 fitted to the buses 1 through a thermally conductive member 24 (liquid 25). When a worker repairs or replaces the sensor 22, etc., the risk of electric shocks is reduced, because he is not required to directly touch charged sections, namely, the buses 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus bar temperature monitor for monitoring a bus bar temperature rise due to heat generation due to an increase in contact resistance caused by loosening of bolts or the like at a bus bar conductor connecting portion and corrosion of a contact portion. is there.

[0002]

2. Description of the Related Art An example of a busbar temperature monitoring device that attaches a temperature detector to a busbar conductor and issues an alarm when the output of the temperature detector exceeds a certain value is disclosed in, for example, Japanese Utility Model Publication Sho 63-90932. What has been done is known. Further, as a high temperature temperature detector used in such a bus temperature monitor, for example, one disclosed in Japanese Utility Model Laid-Open No. 62-178338 is known. These conventional bus temperature monitoring device and temperature detector are shown in FIGS. 4 and 5, respectively.

In the conventional busbar temperature monitoring apparatus shown in FIG. 4, busbar conductors 100A and 100B are fixed by bolts 101, and a temperature detector 102 is provided near the bolts 101. The temperature detector 102 is connected to the converter 103, and the converter 103 is further connected to the alarm indicator 104.

In the conventional temperature detector 102 shown in FIG. 5, a thermistor 201 is fixed to a ceramic support 205 by an adhesive 202. Further, the outside of the support 205 and the thermistor 201 is a protective case 208 made of ceramics.
Are covered by.

[0005]

In the conventional busbar temperature monitoring apparatus, the temperature detector 102 is a direct busbar conductor 100A and 100B.
Since it is attached to B, when the temperature detector 102 is repaired or replaced, the worker has to directly touch the charging part, that is, the bus bar conductor, which may cause an electric shock accident. The present invention has been made to solve the above problems, and an object of the present invention is to provide a bus temperature monitoring device that prevents an electric shock accident during repair or replacement of the temperature detector.

[0006]

A busbar temperature monitoring device according to the present invention is a busbar formed by connecting a plurality of strip-shaped metal conductors in the longitudinal direction thereof, and a conductor for connecting and fixing the strip-shaped metal conductors. A busbar connecting piece, a frame for insulating and holding the busbar, a temperature measuring member having good thermal conductivity attached to the busbar connecting piece, a temperature detecting member having a temperature sensor adiabatically attached to the frame, A heat conducting member for thermally conductively connecting the temperature measuring member and the temperature detecting member; and a temperature detecting unit remotely connected to the temperature sensor for indirectly detecting the temperature of the temperature measuring member. ing.

[0007]

The temperature sensor is attached to the frame via the temperature detecting member, and the frame and the busbar are electrically insulated. Therefore, at the time of repairing or replacing the temperature sensor, the risk of an operator directly touching the bus bar, which is the charging section, and receiving an electric shock is reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bus bar temperature monitoring device according to the present invention will be described with reference to FIGS. 1 and 2 showing a preferred first embodiment thereof. FIG. 1 is a perspective view showing the structure of an embodiment of a bus bar temperature monitoring device according to the present invention, and FIG. 2 is a sectional view showing the structure of a heat conduction cycle in this embodiment.

In FIG. 1, busbar conductors 2a and 2b are copper- or aluminum-made strip-shaped members (strip-shaped metal conductors) having good conductivity, and a connecting piece 3 made of the same material as these busbar conductors 2a and 2b. Is connected and fixed by a fixing member 4 composed of a bolt, a nut, etc. to form a long-connected bus bar 1. Each busbar 1 is fixed to an insulating support member 5 by a fixing member 6 composed of bolts and nuts, and this insulating support member 5 is fixed to a frame 10 of a housing of a high voltage switchboard or a control panel by a fixing member 11 composed of bolts and nuts. It is fixed.
As a result, the bus bar 1 is insulated and fixed to the frame 10.

The temperature detecting member 20 is made of a metal having good thermal conductivity and is attached to the frame 10 via a heat insulating plate 26. On the other hand, the temperature measuring member 21 is made of a metal having good thermal conductivity and is directly fixed to the surface of the connecting piece 3. A temperature sensor 22 is attached to the temperature detecting member 20, and the temperature measuring member 21 and the temperature detecting member 20 are thermally connected by an insulating heat conducting member 24. The temperature detecting member 20, the temperature sensor 22, the temperature measuring member 21, and the heat conducting member 24 are provided for each bus bar (the first
In this embodiment, three sets are provided. Each temperature sensor 22 is connected to a temperature detecting device 50 via a lead wire 23.
The temperature detecting device 50 is provided in a place far away from the bus bar 1, for example, in a central control room or the like, and always remotely monitors the bus bar temperature.

The insulating heat conducting member 24 has an insulating tube 27 and a liquid 25 filled as a heat transfer medium, as shown in FIG. The insulating tube 27 is made of rubber or soft plastic and has flexibility. Further, as the liquid 25, known oil or the like having an insulating property is used. Temperature detecting member 20 and temperature measuring member
Reference numeral 21 has pipe portions 20b and 21a for circulating the liquid 25, and the pipe portions 20b and 21a are thermally connected by a heat conducting member 24, that is, an insulating pipe 27 and the liquid 25.

The operation of the bus temperature monitoring device according to the first embodiment, which is constructed as described above, will be described. When the bus bar 1 is energized, the bus bar conductors 2a and 2b and the connecting piece 3 generate heat due to their electrical resistance. The temperature measuring member 21 attached to the surface of the connection piece 3 is heated by this heat generation. At the same time, temperature measuring member
The liquid 25 inside the tube portion 21a of 21 is also heated. On the other hand, since the liquid 25 inside the insulating pipe 27 and the pipe portion 20b of the temperature detecting member 20 is not heated, a temperature difference occurs in the liquid 25. Due to this temperature difference, convection occurs in the liquid 25, and the heated liquid 25 inside the pipe portion 21a of the temperature measuring member 21 flows through the insulating pipe 27 to the pipe portion 20b of the temperature detecting member 20. Here, after transferring a part of the heat to the temperature detecting member 20, the heat returns to the tube portion 21a of the temperature measuring member 21 through the insulating pipe 27. As this circulation is repeated, the temperature of the temperature detecting member 20 becomes substantially equal to the temperature of the temperature measuring member 21, and thus the temperature of the bus bar 1. Here, since the heat insulating plate 26 is provided between the temperature detecting member 20 and the frame 10, heat conduction through the insulating support member 5 and the frame 10 is small. The temperature sensor 22 detects the temperature of the temperature detecting member 20, which is substantially equal to the temperature of the bus bar 1, and outputs the temperature to the temperature detecting device 50 via the lead wire 23. Then, the temperature detection device 50
When the abnormal heating of the temperature of the bus bar 1 is detected, the central control device (not shown, not shown) equipped with a microprocessor or the like fixes the fixing member 4 fixing the bus bar conductors 2a and 2b and the connecting piece 3. It is judged that the contact resistance of the contact surfaces of the busbar conductors 2a and 2b and the connection piece 3 has increased due to the slack of the
Stop energizing.

Next, a second embodiment will be described with reference to FIG. Since the members having the same numbers as those in the first embodiment shown in FIGS. 1 and 2 are substantially the same, the description thereof will be omitted. In FIG. 3, temperature measuring members 21 are attached to the connecting pieces 3 of each bus bar 1 (three in the second embodiment). On the other hand, the temperature detection member 20 and the temperature sensor
Only one set of 22 is provided on the frame 10. And
The three temperature measuring members 21 and the temperature detecting member 21 are thermally connected in series by an annular heat conducting member 24. When any one of the temperature measuring members 21 reaches an abnormally high temperature, the temperature sensor 21 detects an increase in temperature. In the case of the second embodiment, one temperature sensor 22 monitors the temperatures of a plurality of bus bars 1.

[0014]

As described above, according to the present invention, the temperature detecting member is provided on the frame 10 which is electrically insulated from the bus bar 1.
20 and the temperature sensor 22 are attached, and the heat conducting member 24 (liquid 2
5) The temperature of the temperature measuring member 21 on the bus bar 1 is measured via the temperature sensor 2
Since it is indirectly measured by the method 2, the worker does not have to directly touch the busbar 1 which is the charging portion when repairing or replacing the temperature sensor 22 and the like, and the risk of electric shock is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a first embodiment of a bus temperature monitoring device according to the present invention.

FIG. 2 is a partial cross-sectional view of the cross-sectional view showing the configuration of the heat conduction cycle in the first embodiment.

FIG. 3 is a perspective view showing the configuration of a first embodiment of the busbar temperature monitoring device according to the present invention.

FIG. 4 is a diagram showing a schematic configuration of a conventional bus bar temperature monitoring device.

FIG. 5 is a cross-sectional view showing the configuration of a conventional temperature detector.

[Explanation of symbols]

 1 Bus bar 2a, 2b Bus conductor 3 Connection piece 5 Insulation support member 10 Frame 20 Temperature detection member 21 Temperature measurement member 22 Temperature sensor 24 Heat conduction member 25 Liquid 26 Insulation plate 27 Insulation pipe 50 Temperature detection device

Claims (2)

[Claims] 1. A busbar formed by connecting a plurality of strip-shaped metal conductors in its longitudinal direction, a busbar connecting piece of a conductive material for connecting and fixing the strip-shaped metal conductors, and a frame for insulatingly holding the busbars. A temperature measuring member having good thermal conductivity attached to the busbar connecting piece, a temperature detecting member thermally attached to the frame and having a temperature sensor, the temperature measuring member and the temperature detecting member being heat conductive A busbar temperature monitoring device comprising: a heat conducting member connected to the temperature sensor; and a temperature detecting unit that is remotely connected to the temperature sensor and indirectly detects the temperature of the temperature measuring member. 2. The busbar temperature monitoring device according to claim 1, wherein the heat conducting member is formed of an electrically insulating annular pipe and a liquid filled therein.